Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16becc7f98441e3…

MALICIOUS

PDF

40.8 KB Created: 2020-03-15 00:28:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 215d8a5845d7aabd95eca15e435ae7b1 SHA-1: 23f569c541a2a664ce26ebbc2effcfdd2208fb2d SHA-256: d16becc7f98441e30063c556b03aa17f2620da2313f471da4ac7e74348025721
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of SEO poisoning or a link farm designed to drive traffic to potentially malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ddeventsinternational.gammaxiques.org/uploads/1/3/0/7/130776452/130776452.html#jnv+class+11+admission+form+2018
    • http://sunshincn.com/uploads/1/3/0/7/130776460/9934233.pdf
    • http://arsenalschoolksa.com/uploads/1/3/0/5/130550873/fiwut-dajimanileb-fesofoxijeza-lugetanus.pdf
    • http://www.caskpro.com/uploads/1/3/0/9/130969420/c4a7b88c08a90d8.pdf
    • http://easyownhomes.net/uploads/1/3/0/6/130620528/6828514.pdf
    • http://myartscout.com/uploads/1/3/0/3/130379447/pabanifizag_pavaduzolubud.pdf
    • http://www.pesgba.com/uploads/1/3/0/8/130813588/8e12cfa4688.pdf
    • http://msantwih.com/uploads/1/3/0/6/130604341/4660009.pdf
    • http://sapienceconsulting.net/uploads/1/3/0/7/130739405/7685511.pdf
    • http://aphrodite.ward-one.net/uploads/1/3/0/6/130620460/kuzezevowoxoz.pdf
    • http://washingtonestatestransport.com/uploads/1/3/0/3/130313306/gosevaxa-limowozuj-boxij-balezale.pdf
    • http://www.myleadher.org/uploads/1/3/0/6/130605472/nolefivafajedak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007484.bin
0716f37c1ebe1fe7ef104bc9e937bfff754fe6869a9b7b5d19692ed3181b8795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7484 8780 bytes

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